PROPELLER Flashcards
is a rotating fan-like structure that is used to propel the ship by using the power generated and transmitted by the main engine of the ship
PROPELLER
The manufacturing cost is lower than other types.
Are normally made up of aluminum alloy.
Gives a good high-speed performance.
The acceleration is better than othertypes.
Low-speed handling is not much efficient.
3 BLADE PROPELLER
The manufacturing cost is higher than the 3 blade propellers.
are normally made up of stainless steel alloys.
Have better strength and durability.
Gives good low-speed handling and performance.
Has a better holding power in rough seas.
provides a better fuel economy than all the other types.
4 BLADE PROPELLER
Manufacturing cost is higher of all.
Vibration is minimal from all the other types.
have better holding power in rough seas.
5 BLADE PROPELLER
Manufacturing cost is high
Vibration is minimal from all the other types
have better holding power in rough seas.
the induced pressure field over the propeller decreases
6 BLADE PROPELLER
propeller are permanently attached to the hub
are cast and the position of the blades and hence the position of the pitch is permanently fixed and cannot be changed during the operation
are robust and reliable as the system doesn’t incorporate any mechanical and hydraulic connection
FIXED PITCH PROPELLER
it is possible to alter the pitch by rotating the blade about its vertical axis by means of mechanical and hydraulic arrangement
This helps in driving the propulsion machinery at constant load with no reversing mechanism required as the pitch can be altered to match there quired operating condition
CONTROLLED PITCH PROPELLER
They are located normally at the stern behind propeller(s) to produce a transverse force and steering moment about the ship center of gravity by deflecting the water flow to the direction of the foil plane
used for steering and maneuvering a vessel
RUDDER
a rudder plate that is fixed to the rudder stock only at the top of the rudder
SPADE OR BALANCED RUDDER
These rudders have their stocks attached at the forward most point of their span
the rudder stock runs along the chord length of the rudder
UNBALANCED RUDDER
is a space for carrying cargo in the ship’s compartment
CARGO HOLD
a tall spar, or arrangement of spars, erected more or less vertically on the center-line of a ship or boat
Its purposes include carrying sails, spars, and derricks, and giving necessary height to a navigation light, look-out position, signal yard, control position, radio aerial or signal lamp
MAST
carrying liquid cargoes in bulk are further categorized and dealt with as Oil Tankers and Tankers carrying other liquid chemicals in bulk like Liquified Natural Gas, Ammonia etc.
BULK CARRIER CARGO HOLD
Containers are loaded/unloaded vertically through hatch openings as owing to their large size
CONTAINER VESSEL CARGO HOLD
are devices and machinery for loading and unloading goods that are provided by ships
They mainly include boom devices, deck cranes and other loading and unloading machinery
The control of marine deck cranes is mainly divided into two aspects: vertical control to reduce the influence of hull motion and lateral anti-swing to restrain load swing
DECK CRANE
